gzornenplatz
You certainly had a Registration Card and now you've lost it!
Luckily for you as
Petet's link
The 1939 National Identity Card explains they will for 42 quid provide a copy of the information if you are
dead. Even more lucky for you the need to have and carry your card ceased when the Identity Card was finally abolished in February 1952.
Further should you wish to take this to Brussels as Danny suggests
, a good starting point is your NHS identity number this the same number as your original Registration Card Number.
Plenty of interesting reading in that link.